Variability of currents and horizontal eddy coefficients in Eastern Long Island Sound |
| |
| Authors: | D Tolmazin WF Bohlen M Fecher |
| |
| Institution: | 1. Marine Sciences Department/Institute, University of Connecticut, Groton, CT 06340, U.S.A.;2. Naval Underwater Systems Center, New London, CT 06320, U.S.A. |
| |
| Abstract: | Various circulatory mechanisms within the mesoscale range of tidal flows in Eastern Long Island Sound (LIS) are investigated. Two 13-day time series of current measurements were obtained using three moorings arranged in the form of a triangle. Each mooring contains a single Aanderaa current meter located at a depth of 18 to 20 m.Statistical analysis provides evidence of residual circulation effects of topographic origin in the average flow field. The relative importance and periods of orderly residual patterns and turbulent motions are examined using kinetic energy spectra for the longitudinal and transverse components of the flow. The analyses reveal residual oscillations having nearly the same time scales for all moorings and horizontal turbulent eddies which display a diversity of temporal scales ranging from 0.6 to 2.5 h. Within the high-frequency band of temporal scales the computed spectral curves for longitudinal components generally follow Kolmogorov's ‘ ?5/3 law’, while the spectra of transverse components have a slope of approximately ?1.A computational technique is described to calculate horizontal eddy coefficients in various directions using the mixing length hypothesis. The coefficients developed using this technique are used to investigate various oscillatory mechanisms in the tidal flows. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
